Still there is a pretty big difference between eating regular white rice vs the parboiled and brown rice right?
Well that depends on how you look at it; there is the theoretical and the practical. Theoretically there is a sizable difference between short grain white and long grain brown rice (20 or so point on the GI).
Practically speaking total glycemic load is more important (GI x quantity). So if you compare 1/2 cup of each, the difference in glycemic load will be 4 times smaller than if you compare 2 cups of each.
This is also why I made the comment about more frequent, smaller meals. As the quantities become smaller GI differences matter less. Remember though that higher GI foods are generally more processed and have less overall nutrition.
Think of arguing which is the faster car, a Porsche or a Ferrari? Sure you can use the top speeds that Road & Track got on the track, but does it really matter? You will never come close to either because of limitations on the street.